Upfitter switch kit

Years 2015, 2017–20, 2022–27 Models 4 Factory citations 28

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Also described as Wiring junction block, equipment accessory, with two 30 amp circuitsUpfitter switches, 4

Also documented for Chevrolet

Documented applications

Savana — GMT610 (2003–2027)

2017–2018, 2022–2027 Factory-verified

O: Cargo TG33705, Cutaway 1WT (2027), Cutaway 2WT (2025–2026), Cutaway TG33503 (2025–2026), Cutaway TG33803 (2025–2026); not offered: Cargo TG23405, Cargo TG23705, Cargo TG33405, Cutaway TG33903 (2025–2026); in the 2025–2027 guides only in the Cargo and Cutaway guides

GM factory document — 2017 chevrolet express savana electrical body builders manual service manual 2017 en us, p.3.
GM factory document — 2018 chevrolet 18 express savana bodybuilders sm 2017nov06, p.14.
GM factory document — 2022 chevrolet 22 express savana electrical body builder sm en us 2021oct12, p.12.
GM factory document — 2025 chevrolet my25 express savana electrical bbm, p.10.
GM factory document — 2025 gmc savana cargo fleet order guide, p.24.
GM factory document — 2025 gmc savana cutaway fleet order guide, p.30.
GM factory document — 2026 chevrolet my26 express savana electrical bbm, p.10.
GM factory document — 2026 gmc savana cargo fleet order guide, p.26.
GM factory document — 2026 gmc savana cutaway fleet order guide, p.33.
GM factory document — 2027 gmc savana cargo fleet order guide, p.23.
GM factory document — 2027 gmc savana cutaway fleet order guide, p.16.

Sierra HD — K2XX (2015–2019)

2015, 2018–2019 Factory-verified

the 2018 and 2019 guides add four 30-amp circuits for aftermarket accessories; 2015 marks: Sierra: O; SLE, SLT: not offered; 2018: GM's 2018 Sierra 2500HD order guide

GM factory document — 2015 gmc sierra 2500hd fleet order guide wayback, p.2.
GM factory document — 2019 gmc sierra 2500hd fleet order guide wayback, p.1.
GM factory document — 2018 gmc sierra 2500hd order guide copy gm authority, p.16.

Sierra HD — T1XX (2020–2027)

2025–2027 Factory-verified

provides three 30-amp and two 20-amp configurable circuits; shipped loose; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O

GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.32.
GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.30.
GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.31.

Sierra — T1XX (2019–2026)

2019–2020, 2022–2026 Factory-verified

the upfitter lists read "Equipment, accessory wiring junction block"

GM factory document — 2019 gmc 19 sierra 1500 body builder feb 20, p.9.
GM factory document — 2020 gmc 20 sierra 1500 electrical body buil 1, p.10.
GM factory document — 2022 gmc 22 sierra 1500 new electrical body builder sm en us 2022jul20, p.10.
GM factory document — 2023 gmc 23 sierra 1500 electrical body builder sm en us 2022oct12, p.9.
GM factory document — 2024 gmc 24 sierra 1500 sm electrical body builder esid 23dec12, p.11.
GM factory document — 2025 gmc my25 sierra 1500 electrical bbm, p.9.
GM factory document — 2025 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

This page aggregates every documented appearance of 9L7 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.